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[Fibonacci <1480403@xxxxxxxxxxxxxxxxxx>]

Works fine on v3.19.8-ckt4, still fails on 4.xx and on v3.19.0-23.

** Changed in: linux (Ubuntu)
       Status: Triaged => Confirmed

** Tags added: kernel-fixed-upstream

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Title:
  Display manager shows only a black screen

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I've noticed that, since the update to kernel 3.19.0-23, SDDM only
  shows a black screen instead of the usual login screen. It, however,
  works flawlessly on 3.19.0-22.

  I've also noticed that the nvidia module is absent from lsmod in
  3.19.0-23 onwards, but present in 3.19.0-22, and that is likely
  related, since I use nVidia GeForce GTS 250 graphics.

  Additionally, I've tried kernels from http://kernel.ubuntu.com
  /~kernel-ppa/mainline/ and have noticed that versions 4.0 onwards fail
  in exactly the same way I described, while 3.19.8 (the latest
  available 3.xx) works fine.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-25-generic 3.19.0-25.26
  ProcVersionSignature: Ubuntu 3.19.0-25.26-generic 3.19.8-ckt2
  Uname: Linux 3.19.0-25-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  Date: Fri Jul 31 11:37:05 2015
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=7e89a62d-4e77-40fc-89ba-42c3b1e76fc0
  InstallationDate: Installed on 2015-07-13 (18 days ago)
  InstallationMedia: Kubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-3.19.0-25-generic root=UUID=0e051a2e-be67-40a6-8d32-29d4de69aca1 ro rootflags=subvol=@ quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-25-generic N/A
   linux-backports-modules-3.19.0-25-generic  N/A
   linux-firmware                             1.143.2
  RfKill:
   
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/04/2012
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: BLH6710H.86A.0160.2012.1204.1156
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: DH67BL
  dmi.board.vendor: Intel Corporation
  dmi.board.version: AAG10189-206
  dmi.chassis.type: 3
  dmi.modalias: dmi:bvnIntelCorp.:bvrBLH6710H.86A.0160.2012.1204.1156:bd12/04/2012:svn:pn:pvr:rvnIntelCorporation:rnDH67BL:rvrAAG10189-206:cvn:ct3:cvr:

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